Compiling PTLIB library for AM335x failure

Hello,

I'm beginner in embedded Linux environment so may be I will ask some stupid questions.

I would like to compile a VOIP application at my AM335x kit, the first thing what I should do is to cross-compile the PTLIB library. the problem is , when I make (./configure) to the ptlib source I found this message:

checking alsa/asoundlib.h usability... no
checking alsa/asoundlib.h presence... no
checking for alsa/asoundlib.h... no
checking for ALSA sound support... no

Before compiling the PTLIB library I have already compiled the alsa library and I gave the path of alsa to PTLIB.

Knowing that, I managed to detected the alsa library when I compiled the ptlib library at my linux desktop (ubuntu)

Is someone has already cross-compiled the ptlib library could help me, really I'm blocked!!!

Thanks in advance,